Circles

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Circles

  1. 1. Circles By: Javent Erl Cadalso
  2. 2. What is circle?  A line forming a closed loop, every point on which is a fixed distance from a center point.  The word "circle" derives from the Greek, kirkos "a circle," from the base ker- which means to turn or bend.
  3. 3. Properties of a circle  Center A point inside the circle. All points on the circle are equidistant (same distance) from the center point.
  4. 4.  Radius The radius is the distance from the center to any point on the circle. It is half the diameter.  Diameter The distance across the circle. The length of any chord passing through the center. It is twice the radius.
  5. 5.  Chord A line segment linking any two points on a circle.  Tangent A line passing a circle and touching it at just one point.
  6. 6.  Secant A line that intersects a circle at two points.
  7. 7. Formulas of circle in circumference and area  Circumference  Area
  8. 8. Exercises 1. Find the circumference of a circle with a diameter of 11 millimeters. 2. Find the diameter of a circle with a circumference of 21.98 meters. 3. Find the area of a circle with a radius of 4 inches. 4. Find the radius of a circle with an area of 200.96 square feet. 5. If the radius of a circle is 1.5 inches, then what is the circumference?
  9. 9. How to draw a circle Compass  An instrument containing a magnetized pointer that shows the direction of magnetic north and bearings from it.  An instrument for drawing circles and arcs and measuring distances between points, consisting of two arms linked by a movable joint, one...
  10. 10. Use a compass to draw a circle of radius 4 cm. Step 1: Use a ruler to set the distance from the point of the compass to the pencil's lead at 4 cm. Step 2: Place the point of the compass at the centre of the circle. Step 3: Draw the circle by turning the compass through 360º.
  11. 11. Exercises 1. Draw a circle with a circumference is 10 mm 2. Draw a circle with a diameter is 20mm 3. Draw a circle with having an area of 12cm squared 4. Draw a circle with a radius of 2mm 5. Draw a circle with having an area of 10mm squared
  12. 12. Reference  http://en.wikipedia.org/wiki/Circle  http://www.mathopenref.com/circle.  www.mathsisfun.com/geometry/circle. html  www.math.com/school/subject3/lesson s/S3U1L6GL.html  www.circles.com/
  13. 13. Thank you for listening. .

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